Millstone-bush



M. FRENCH.

Millstone Bush.

Patented April 3, 1860.

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MOSES FRENCH, OF LEESVILLE, INDIANA.

MILLSTONE-IBUSH.

Specification of Letters Patent No. 27,709, dated April 3, 1860.

To all whom it may concern:

Be it known that I, Mosns FRENoI-I, of Leesville, in the county of Lawrence and State of Indiana, have invented a new and Improved Millstone-Bush; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1, is a vertical section of my invention taken in the line 00, 00, Fig. 3; Fig. 2, is a vertical section of the same, taken in the line y, y, Fig. 3; Fig. 3, is a plan or top view of the same.

Similar letters of reference indicate cor responding parts in the several figures.

The object of this invention is to obtain a bush for mill stones that will be self-adjusting, or in other words one that will compensate automatically for the wear of the wedges and at the same time afford facility for the ready lubrication of the spindle.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A, represents a. cast metal box through the center of which the mill stone spindle B, passes. Against the spindle B, four wedges O, bear and retain it in proper position. The wedges C, increase in thickness from their upper to their lower ends as shown clearly in Fig. 1, and said wedges are retained in proper position by wedges D, which are tapered. in a reverse manner to the wedges C, and have each a plate or strip a, attached, said plates or strips extendin down to the bottom of the box A, and having horizontal steps or projections 6, attached on mhich the lower ends of spiral springs E, bear, the upper ends of said springs being attached to horizontal plates 0, which are permanently secured in the box A.

The springs E, are compressed between the projections b, and plates 0, so that they will have a tendency to draw the wedges C, snugly against the spindle B. This will be clearly understood by referring to Fig. 1, the arrows 1, Fig. 1, indicating the clownward pressure of the wedges D, and the ar rows 2, the lateral pressure of the wedges C, on the spindle due to the downward pressure of the wedges D, consequent on the action of the springs E. Thus it will be seen that the wedges C, are automatically adjusted to the spindle as they wear.

The wedges C, D, are fitted in proper compartments in the box A, formed by vertical partitions (Z, said partitions also forming a quadrilateral compartment 6, at each corner of the box as shown clearly in Fig. 3. In each compartment 6, a plunger F, is placed. These plungers have each a rack f, at their lower parts into which pinions g, gear, two pinions on one shaft h gearing into two contiguous racks, and consequently two shafts will be required, although only one is shown in Fig. 3.

The upper ends of the plungers F, may each be provided with a packing in order that the oil may be retained in the compartments 6, and at the inner angles of said compartments 6, adjoining the spindle, a groove or channel 2', is made, see Figs. 2 and 3.

The compartments 6, above the plungers F, are supplied with oil, or other lubricating material represented by a red tint, and when the spindle requires to be lubricated, the shafts h, are simply turned by hand and the plungers F, elevated so as to cause a flow of oil through the grooves 2', to the spindle B. It will be seen therefore that the spindle may be lubricated with the greatest facility and without removing the upper stone.

I would remark that the box A, may be inserted in the lower or bed stone in any proper way but the box A, must extend some distance below the stone in order to render the shaft h, accessible, and also that screws 7', may be employed in order to bear against the sides of the strips (0, and prevent too great an action of the springs E, and a consequent unnecessary pressure of the wedges C, against the spindle B. Each shaft 71., I would also remark, is provided with a ratchet is, into which pawls Z, catch to retain the plungers F, in proper position.

I do not claim separately and broadly the employment or use of adjustable wedges irrespective of the arrangement herein tially as and for the purpose herein set shown and described, but,

I do claim as new and desire to secure by Letters Patent,

The employment in combination with the box A, and spindle B of the adjustable plungers F, and oil channels substanforth and described.

MOSES FRENCH.

Witnesses WILLIAM ALLEN, ELISHA DEAN. 

